tertiary

Third in place, order, degree, or rank.

Of, relating to, or designating the short flight feathers nearest the body on the rear edge of a bird's wing.

Of, relating to, or having a carbon atom that is attached to three other carbon atoms in a molecule.

Of or relating to the replacement of three of several atoms or groups in a compound, such as an amine in which three valences of the functional group are taken by carbon atoms.

Of or relating to salts of acids containing three replaceable hydrogen atoms.